Other polls conducted with Pennsylvania voters have suggested the two candidates are neck-and-neck in the state. A July Quinnipiac poll showed Trump ahead of Clinton by two points, while a recent Public Policy Polling survey had Clinton at three points ahead of Trump.

According to the F&M poll, Clinton got a big boost among voters after the party's convention in Philadelphia, with 36 percent saying they were much more likely to vote for her after the event. On the other hand, 44 percent of voters said they were much less likely to vote for Trump after the Republicans' convention in Cleveland.

Trump still leads Clinton in Pennsylvania among white men (45-35 percent) and those with a high school degree or less (53-31). Clinton leads with white women (57-29) and college-educated whites (58-28).

The poll also surveyed respondents on the U.S. Senate race in Pennsylvania. Democratic challenger Katie McGinty leads incumbent Republican Pat Toomey by a margin of 39-38 percent among likely voters, according to the poll.

The poll surveyed 661 registered voters in the state: 321 Democrats, 257 Republicans and 83 Independents. It was conducted from July 29 to Aug. 1 and had a margin of error of 4.8 percentage points.